This is the same as XUnresolvedVariable, but it assumes that the
context is already set up.

Package org.apache.xalan.templates Description

Implements the Templates interface,
and defines a set of classes that represent an XSLT stylesheet.

StylesheetRoot implements the Templates interface, and
extends StylesheetComposed,
which is a Stylesheet composed of itself
and its included Stylesheet objects. A StylesheetRoot also contains a
global list of all imported StylesheetComposed objects. The
role of these objects is to hold immutable stylesheet data, not to perform
procedural tasks associated with the
construction of the data (the org.apache.xalan.processor package) or with the transformation (the org.apache.xalan.transformer
package).

ElemTemplateElement is the superclass of
all XSLT instruction elements, including Stylesheet. The xFunc classes
extend members of the org.apache.xpath package and implement XSLT functions. Unlike
the Stylesheet "container" objects, the
instruction element and function classes do contain procedural execute()
methods that are called during the transformation.